Optical disc and contamination detection system in an apparatus

Details Optical disc and contamination detection system in an apparatus Optical disc and contamination detection system in an apparatus

1994-01-28

1996-04-30

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 54, 369 58, G11B 700

Patent

active

055131603

ABSTRACT:
An inspection sector area is disposed on each data sector area of the recording area of an optical disc, and predetermined reference inspection data is recorded in the inspection sector area of a new optical disc before use. The recorded inspection data is reproduced and the number (Ej) of data errors which initially occur in the optical disc is detected by comparing the reproduced inspection data with the inspection data during recording and is memorized in the optical disc. During operation, the recorded inspection data is reproduced and compared with the reference data, and the number (Em) of data errors is issued, thereby producing the number of data errors due to particulate contamination as given by a difference between the numbers (Ej) and (Em).

REFERENCES:
patent: 4789974 (1988-12-01), Satoh et al.
patent: 4896311 (1990-01-01), Ishihara
patent: 4969139 (1990-11-01), Azumatani et al.
patent: 4984230 (1991-01-01), Satoh et al.
patent: 5031112 (1991-07-01), Sakai et al.
patent: 5068842 (1991-11-01), Naito
patent: 5075804 (1991-12-01), Deyring

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